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<p style="margin: 10px 0 0 0">Started looking at this today, specifically in terms of 2 issues:</p>
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Determining the proper call syntax. Should the call SQL be rendered as {<tt>call the_name(...)</tt>} versus {<tt>?=call the_name(...)</tt>}
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Fitting definition and handling of the function return into JPA <tt>Parameter</tt> API. The main issue here is the "undefined" nature of mixing named and positional parameter registrations as part of <tt>StoredProcedureQuery</tt>. If <tt>StoredProcedureQuery</tt> is using just positional parameters for a function call then there is no issue. The problem comes when trying to use named parameter registrations for the function call. Basically the safest bet is to keep a separate reference to the "function return".
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<p style="margin: 10px 0 0 0">Also of concern is how much effort to put into making the JPA <tt>StoredProcedureQuery</tt> API work as-is for function calls versus assuming that users will have to make Hibernate-specific calls. As I said above, I think that handling the "function return" separately from parameter registrations is the best approach; but that will require Hibernate-specific calls. JPA users would need to cast <tt>StoredProcedureQuery</tt> (via <tt>#unwrap</tt>) to the Hibernate <tt>ProcedureCall</tt> and register the function return via that API:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">interface</span> FunctionReturn<T> <span class="code-keyword" style="color: #000091">extends</span> ParameterRegistration<T> {
...
}
<span class="code-keyword" style="color: #000091">interface</span> ProcedureCall {
...
<T> FunctionReturn<T> registerFunctionReturn(<span class="code-object" style="color: #910091">Class</span><T> type, <span class="code-object" style="color: #910091">boolean</span> isRefCursor);
}
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<p style="margin: 10px 0 0 0">As is, the above would not be accessible via JPA parameters. </p>
<p style="margin: 10px 0 0 0">WDYT?</p>
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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-8445" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/task.png" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-8445" style="color: #3b73af; text-decoration: none">HHH-8445</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-8445" style="color: #3b73af; text-decoration: none">Implement REF_CURSOR support for StoredProcedureQuery</a> </span>
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{code} <br /> Session session = em.unwrap(Session.class); <br /> org.hibernate.procedure.ProcedureCall call = <br /> session.createStoredProcedureCall("FIND_ITEMS"); <br /> <br /> call.registerParameter(1, Object.class, ParameterMode.REF_CURSOR); <br /> <br /> org.hibernate.result.ResultSetOutput resultSetOutput = <br /> (org.hibernate.result.ResultSetOutput) call.getResult().getCurrent(); <br /> ...
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